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Long-term isothermal experiments of soot combustion were performed on Yttria-stabilized Zirconia, an oxygen ionic conductor, at 370, 390 and 410°C. At these temperatures, isotopic experiment confirms that mobile YSZ bulk oxygens oxidize soot at the soot/YSZ interface. In parallel, the surface oxygen exchange process replenishes YSZ oxygen atoms. After long-term isothermal experiments, HR-TEM observations...
This study reports a mechanistic study of the soot oxidation on Yttria-Stabilized Zirconia (YSZ), a non-reducible oxide with intrinsic bulk oxygen mobility. Temperature-Programmed Oxidation (TPO) and isotope exchange experiments demonstrate the key role of bulk oxygen species in the oxidation process. When “intimate” soot/YSZ contact is achieved after in situ carbon deposition via propylene cracking,...
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